Here is a good one:

Homeowner has a backed up sewer line.
Plumber comes out and cannot unblock it with a snake.
City goes out to dig up their area and finds a Fernco that was put on and buried with no clamps. The weight of the soil pushed the Fernco through the gap and into the pipe causing the blockage.

Plumber who showed up and could not fix the problem only ran his snake in to the blockage point. He gives the homeowner a bill for $550.

Homeowner calls city hall to complain.

City fines plumber $1,000. for working without a permit.

Lesson learned,..........don't gouge.